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Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Estimated Amortization Expense, For the remaining nine months ending December 31, 2015 | $ 615,234 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |
Estimated Amortization Expense, For the fiscal years ending December 31: 2016 | 478,400 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |
Estimated Amortization Expense, 2017 | 188,494 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
Estimated Amortization Expense, 2018 | 68,122 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |
Estimated Amortization Expense, 2019 | 65,410 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |
Estimated Amortization Expense, 2020 | 58,549 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |
Estimated Amortization Expense, Thereafter | 205,385 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |
Total aggregate amortization expense | 1,679,594 us-gaap_FiniteLivedIntangibleAssetsNet | 1,317,575 us-gaap_FiniteLivedIntangibleAssetsNet
Estimated Net Increase (Decrease) in Rental Revenue, For the remaining nine months ending December 31, 2015 | 107,289 land_EstimatedNetIncreaseDecreaseInRentalRevenueRemainderOfFiscalYear |
Estimated Net Increase (Decrease) in Rental Revenue, For the fiscal years ending December 31: 2016 | (17,004)land_EstimatedNetIncreaseDecreaseInRentalRevenueCurrent |
Estimated Net Increase (Decrease) in Rental Revenue, 2017 | (8,437)land_EstimatedNetIncreaseDecreaseInRentalRevenueInTwoYears |
Estimated Net Increase (Decrease) in Rental Revenue, 2018 | 4,577 land_EstimatedNetIncreaseDecreaseInRentalRevenueInThreeYears |
Estimated Net Increase (Decrease) in Rental Revenue, 2019 | 4,577 land_EstimatedNetIncreaseDecreaseInRentalRevenueInFourYears |
Estimated Net Increase (Decrease) in Rental Revenue, 2020 | 4,577 land_EstimatedNetIncreaseDecreaseInRentalRevenueInFiveYears |
Estimated Net Increase (Decrease) in Rental Revenue, Thereafter | 8,010 land_EstimatedNetIncreaseDecreaseInRentalRevenueThereafter |
Total Estimated Net Increase (Decrease) in Rental Revenue | $ 103,589 land_EstimatedNetIncreaseDecreaseInRentalRevenue |

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